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Sherline 4345 connection to Sprint drive board

Posted: Wed 08 Dec , 2021 18:36 pm
by robertjenkins
Hello

I have a Sherline 4345 DC motor from a Micromill, and I need to connect it to a Sprint 400 board. The Sprint has four outputs, two for armature and two for field. The motor itself has 5 wires - red, orange, white, green and black. I have no idea how to connect them. The red and black pair have a resistance of about 7 ohms, the white and orange about 1 ohm. The green doesn't seem to have any continuity with any of the other wires but about 1.5k to the body of the motor. Ideas?
Thanks

Re: Sherline 4345 connection to Sprint drive board

Posted: Thu 09 Dec , 2021 9:09 am
by Martin
The red and black pair have a resistance of about 7 ohms.
Motor Armature
The white and orange about 1 ohm.
Thermal sensor
The green and black.
Earth

Re: Sherline 4345 connection to Sprint drive board

Posted: Thu 09 Dec , 2021 10:00 am
by robertjenkins
Great, thank you.
Since my board seems to blow a fuse (or trip the RCD) every time I connect power, would there be any problem with a much simpler set-up:
a step down transformer, bridge rectifier, and relay to switch on and off? I wouldn't be able to vary the speed and direction but that doesn't matter to me much.

Re: Sherline 4345 connection to Sprint drive board

Posted: Tue 14 Dec , 2021 18:26 pm
by Steve
Hi,

Find attached drawings of how the Sprint drive was connected to the Micromill in 2000